Including Noise Compensation Patents (Class 370/317)
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Patent number: 7873324Abstract: Apparatus and method for processing a received pilot to obtain noise estimation of a pilot channel and processing a received first signal channel, separately from a second signal channel that is orthogonal to the first signal channel, to obtain a signal level of the first signal channel. The noise estimation and the signal level are used to calculate a SNR value. Detection on the first channel is done by checking the SNR and the sign of a soft metric.Type: GrantFiled: December 21, 2007Date of Patent: January 18, 2011Assignee: Broadcom CorporationInventors: Jun Wu, Hongwei Kong, Li Fung Chang
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Patent number: 7853220Abstract: A wireless communication terminal configured to receive broadcast information on a broadcast channel, to start a timer when a reception quality of the received broadcast information degrades below a specified level on the broadcast channel, and to transmit feedback information only after starting the timer.Type: GrantFiled: March 6, 2009Date of Patent: December 14, 2010Assignee: Motorola Mobility, Inc.Inventors: Robert T. Love, Hao Bi, Brian K. Classon, Joseph R. Schumacher, Dah-Lain Almon Tang
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Patent number: 7852793Abstract: A method and apparatus of transmitting an InitialSetupAttribute message in a wireless communication system, comprising generating the InitialSetupAttribute message comprising an 8 bit AttributeID field, a 2 bit CQIReportingMode field, a 4 bit VCQIReportInterval field, a 2 bit VCQIMeasureInterval field, a 1 bit EnhancedPilotReportEnabled field, a 4 bit EnhancedPilotReportRatio field, a 4 bit EnhancedPilotReportThreshold field, a 2 bit MinReportInterval field, a 2 bit CQIReportInterval field, a 3 bit CQIReportPhase field, a 2 bit CQIPilotInterval field, a 3 bit CQIPilotPhase field, a 3 bit BFCHReportRate field, a 3 bit SFCHReportRate field, a 3 bit BFCHPowerOffset field, a 2 bit NumBFCHBits field, a 3 bit SFCHPowerOffset field, a 2 bit NumSFCHBits and a 3 bit MandatoryCQICHCTRLReportingPeriod field and transmitting the message over a communication link. A method and apparatus is further provided for receiving and processing the InitialSetupAttribute message.Type: GrantFiled: October 27, 2006Date of Patent: December 14, 2010Assignee: Qualcomm IncorporatedInventor: Rajat Prakash
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Patent number: 7852744Abstract: The present disclosure provides a method and apparatus of channel estimation for a wireless communication system. A pilot signal energy is estimated based on received pilot symbols. An estimated traffic signal energy of the traffic signal symbols is estimated based on the received traffic signal symbols, the received pilot symbols and a noise estimate. A traffic to pilot ratio is estimated based on the pilot signal energy and the traffic signal energy.Type: GrantFiled: October 2, 2007Date of Patent: December 14, 2010Assignee: QUALCOMM IncorporatedInventor: Ravi Palanki
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Patent number: 7848221Abstract: Disclosed are a method and system for detecting adjacent channel interference between two systems having neighboring frequencies. The method and system calculates a Fast Fourier Transform (FFT) output for one or more upper and lower frequency side null subcarriers and center data subcarriers of a frequency channel. Power values are calculated for the upper and lower frequency side null subcarriers and the center data subcarriers for use in determining a presence of adjacent channel interference (ACI).Type: GrantFiled: July 14, 2008Date of Patent: December 7, 2010Assignee: Motorola Mobility, Inc.Inventors: Peilu Ding, Ying Cai, Xiang Chen, Xiaowei Jin, Ravindra P. Moorut
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Publication number: 20100279599Abstract: A downstream adaptive modulation system and method. The downstream adaptive modulation system comprises a wireless access termination system and one or more wireless modems. The wireless access termination system includes a plurality of queues and a parser. The parser parses data traffic onto the plurality of queues. Each queue is associated with a different coding and modulation scheme. Each of the one or more wireless modems receives data traffic from the plurality of queues based on the wireless modem's ability to demodulate and decode the signal from each of the plurality of queues. When a wireless modem experiences a change in signal strength, the present invention enables the wireless modem to adapt to data from other queues to compensate for the change in signal strength. Thus, if the signal strength improves over a period of time, the wireless modem may receive data at a higher order modulation and FEC code rate.Type: ApplicationFiled: July 12, 2010Publication date: November 4, 2010Applicant: Broadcom CorporationInventors: Mark Dale, David Hartman, Anders Hebsgaard
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Patent number: 7826861Abstract: A base station including a transmitting and receiving amplifier for amplifying CDMA signals exchanged with a mobile station; a radio stage connected to the transmitting and receiving amplifier for carrying out D/A conversion of a transmitted signal that undergoes baseband spreading, followed by quadrature modulation, and for carrying out quasi-coherent detection of a received signal, followed by A/D conversion; a baseband signal processor connected with the radio stage for carrying out baseband signal processing of the transmitted signal and the received signal; a transmission interface connected with the baseband signal processor for implementing interface with external channels; and a base station controller for carrying out control such as management of radio channels and establishment and release of the radio channels. The base station communicates with the external channels by mapping logical channels into physical channels. The CDMA signals are spread using a short code and a long code.Type: GrantFiled: September 29, 2003Date of Patent: November 2, 2010Assignee: NTT Docomo, Inc.Inventors: Takehiro Nakamura, Junichiro Hagiwara, Etsuhiro Nakano, Koji Ohno, Seizo Onoe, Akihiro Higashi, Motoshi Tamura, Masatomo Nakano, Hiroshi Kawakami, Hiroki Morikawa
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Publication number: 20100238856Abstract: In a satellite communication network, comprised of a central hub and a plurality of remote terminals, a multi-layered return channel (inbound) bandwidth design, for at least the purpose of mitigating rain fade effects. In addition, an allocation algorithm for allocating timeslots against capacity requests from remote terminals over a multi-layered return channel bandwidth design on a burst-by-burst basis.Type: ApplicationFiled: March 17, 2010Publication date: September 23, 2010Applicant: GILAT SATELLITE NETWORKS, LTD.Inventors: Nitay Argov, Shay Mori, Tomer Chavusha
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Publication number: 20100232350Abstract: Apparatus for a satellite communication system, comprising: a processor arrangement to monitor a plurality of frequency channels demultiplexed from a signal comprising one or more carriers, identify at least one frequency channel of the plurality of frequency channels comprising interference and remove the at least one identified frequency channel before the one or more carriers are reformed. By removing the frequency channels comprising interference, the signal-to-noise ratio of a carrier can be improved. Also, if the interference occurs within a carrier, the carrier is usable as long as the removed frequency channels are considerably narrower than the carrier.Type: ApplicationFiled: June 19, 2009Publication date: September 16, 2010Applicant: ASTRIUM LIMITEDInventors: Chiok Keng Leong, Stephen Phillip Brown, Robert Julian Francis Hughes, Anthony Duncan Craig
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Patent number: 7782757Abstract: A method, and device implementing the method, for adaptively allocating pilot signals in a wireless communication system. The method includes receiving channel data, including channel length (L) data, inter-carrier interference power (PICI) data, coherence time (CT) data, and a number of subcarriers (N). The method further includes selecting, when L is greater than a first channel length threshold (LTH1), a first number of pilot signals between a minimum value of L and a maximum number of pilot signals NP,MAX, wherein the first number of pilot signals NP are equally spaced in time according to the CT data, and equally spaced in frequency. Further, the method includes selecting, when L is less than LTH1 and PICI is less than a power threshold (PTH), a second number of pilot signals such that the second number of pilot signals is between the minimum value of L and NP,MAX, wherein the second number of pilot signals are equally spaced in time according to the CT data, and equally spaced in frequency.Type: GrantFiled: September 4, 2008Date of Patent: August 24, 2010Assignee: Industrial Technology Research InstituteInventors: Lai-Huei Wang, Pang-An Ting, Jia-Hao Wu, Jiun-Yo Lai
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Patent number: 7778592Abstract: A downstream adaptive modulation system and method. The downstream adaptive modulation system comprises a wireless access termination system and one or more wireless modems. The wireless access termination system includes a plurality of queues and a parser. The parser parses data traffic onto the plurality of queues. Each queue is associated with a different coding and modulation scheme. Each of the one or more wireless modems receives data traffic from the plurality of queues based on the wireless modem's ability to demodulate and decode the signal from each of the plurality of queues. When a wireless modem experiences a change in signal strength, the present invention enables the wireless modem to adapt to data from other queues to compensate for the change in signal strength. Thus, if the signal strength improves over a period of time, the wireless modem may receive data at a higher order modulation and FEC code rate.Type: GrantFiled: October 19, 2006Date of Patent: August 17, 2010Assignee: Broadcom CorporationInventors: Mark Dale, David Hartman, Anders Hebsgaard
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Inter-station transmission method, radio base station monitoring method, and device using the method
Patent number: 7773568Abstract: A inter-station transmission method of extending time allocated for a transmission path delay of an inter-station transmission path within a predetermined turnaround time, and increasing an inter-station transmission distance. A radio base station reproduces a clock synchronized with a BSU transmission clock DCLK used when transmitting downlink transmission data from a communication control station. The radio base station processes the downlink transmission data. The clock synchronization eliminates a necessity of data format conversion between the communication control station and the radio base station, a buffer accumulating transmission data in preparation for the conversion is not necessary. This reduces a turnaround time of a mobile communication system.Type: GrantFiled: December 9, 2004Date of Patent: August 10, 2010Assignee: Panasonic CorporationInventors: Hidetoshi Yamasaki, Hitoshi Takai -
Patent number: 7773625Abstract: An access method for periodic contention-free sessions (PCFS) reduces interference between overlapping first and second wireless LAN cells contending for the same medium. Each cell includes a respective plurality of member stations and an access point (AP) station. The access method for periodic contention-free sessions (PCFS) includes a fixed cycle time that reduces conflicts with PCFS from other cells. The PCFS from several cells are repeated in cycles of cycle period (CP), which is the contention-free period (CFP) of an access point times a factor that is a function of the number of overlapping cells. Periodic contention-free sessions (PCFSs) are generated, one from each overlapping cell. PCFS transmission attempts occur at the fixed specified time spacing following the start of the previous cycle. Each active AP sets a timer at CP and a PCFS is initiated when the timer expires. The timer is then reset and starts a new cycle.Type: GrantFiled: February 19, 2007Date of Patent: August 10, 2010Assignee: AT&T Intellectual Property II, L.P.Inventor: Mathilde Benveniste
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Patent number: 7761075Abstract: An apparatus and method for interference cancellation in wireless mobile stations operating concurrently in two or more wireless modes.Type: GrantFiled: September 21, 2005Date of Patent: July 20, 2010Assignee: Samsung Electronics Co., Ltd.Inventors: Joseph R. Cleveland, Seong Eun Kim, Lup M. Loh
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Publication number: 20100157881Abstract: Methods and apparatuses for acquiring and demodulating a data stream transmitted in a communication system. A method in accordance with the present invention comprises finding a boundary of a physical layer frame (PLFrame) in the data stream, finding a first 26 bits of a Unique Word (UW) associated with the data stream, finding a scrambling code utilizing the UW, and using a decoding procedure to determine a modulation type and code rate used for desired signals within the data stream.Type: ApplicationFiled: March 8, 2010Publication date: June 24, 2010Applicant: The DIRECTV Group, Inc.Inventors: Joseph Santoru, Guangcai Zhou, Ernest C. Chen, Dennis Lai, Shamik Maitra
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Patent number: 7734262Abstract: In one embodiment, the patent application comprises an access terminal, comprising a processing unit, a memory operably connected to the processing unit, a receive circuitry operably connected to the processing unit, a transmit circuitry having a power amplifier used in both single carrier and multi-carrier operations, wherein said transmit circuitry is operably connected to the processing unit, and a throttle control unit operably connected to the power amplifier, adapted to throttle power to provide sufficient headroom for the power amplifier.Type: GrantFiled: July 13, 2006Date of Patent: June 8, 2010Inventors: Rashid Ahmed Akbar Attar, Donna Ghosh, Christopher Gerard Lott, Naga Bhushan
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Patent number: 7728461Abstract: Disclosed is an improved noise reducing apparatus using an anti-circuit, including a digital logic circuit and a digital anti-circuit corresponding to the digital logic circuit. The digital anti-circuit functions to cancel noise generated by the digital logic circuit. The anti-circuit includes logic to generate a similar number of switching edges as the logic circuit, where the anti-circuit edges are in the opposite direction as the logic circuit. The anti-circuit may have a circuit structure close to that of the noisy circuit, or can be formed of components different in structure but generating an output pattern similar to (and opposite from) the noisy circuit. In some embodiments, the differently structured components can include a state machine coupled to a memory or look-up-table.Type: GrantFiled: June 3, 2004Date of Patent: June 1, 2010Assignee: Cypress Semiconductor CorporationInventor: Paul Beard
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Patent number: 7729657Abstract: The reduction of echo noise in satellite communications includes receiving an aggregate signal from multiple remote stations, where the aggregate signal includes a transmit signal, whose bandwidth is in the range of 0.1 MHz to 66 MHz, is previously sent from a hub to the multiple receiving stations, computing a scaled, delayed and distorted replica of the transmit signal and using the replica to compensate for satellite transponder nonlinearities and reduce echo noise interference from a received aggregate signal received by the hub from the multiple remote stations.Type: GrantFiled: July 7, 2006Date of Patent: June 1, 2010Inventors: Abel Avellan, Sergio Godoy, Sriram Jayasimha, Jyothendar Paladugula
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Publication number: 20100054131Abstract: A method of receiving data packets asynchronously transmitted by a plurality of user terminals using a spread-spectrum medium access protocol, comprises a step of cancelling interferences between colliding packets according to an innovative “sliding window” processing algorithm. A gateway receiver is adapted for carrying out interference cancellation using this algorithm. Asynchronous packet transmission from a user terminal is controlled by estimating a parameter indicative of the quality of information transmission through a communication channel; and inhibiting or allowing data transmission depending on a comparison between said estimated parameter and an adaptively varying threshold. A user terminal comprises transmission control means adapted for carrying out such a method.Type: ApplicationFiled: August 25, 2009Publication date: March 4, 2010Inventors: Oscar del Rio Herrero, Riccardo De Gaudenzi
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Patent number: 7668503Abstract: Disclosed is a secure remote repeater. The secure repeater includes a first remote control signal detector, a remote control signal processor and an emitter. Among other functions, the secure repeater can forward secure remote signals to an electronic device using non-secure commands native to that electronic device. Additionally, the secure remote repeater can filter remote signal chatter.Type: GrantFiled: November 17, 2005Date of Patent: February 23, 2010Inventors: Robert Wilhelm Schumann, David G Grossman
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Publication number: 20100008289Abstract: In exemplary embodiments of the present invention, a degree of hierarchical modulation can be varied as a function of satellite position, which can be related to time of day, and where such hierarchical modulation can be a combination of phase and amplitude shifts. In exemplary embodiments of the present invention, as each satellite in a multiple satellite system broadcasting to North America moves towards a D-node or an A-node position, the offset angle of a phase-based hierarchical modulation scheme can be varied. Thus, in exemplary embodiments of the present invention, the lowest satellite position in the sky can have the lowest offset angle for overlay bits, which offset angle can, for example, progressively increase as the position of the satellite in the sky increases. At a satellite's highest point in the sky, the overlay offset angle can, for example, thus be at its maximum.Type: ApplicationFiled: July 2, 2009Publication date: January 14, 2010Applicant: Sirius XM Radio Inc.Inventor: Carl Scarpa
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Patent number: 7643793Abstract: A method for relaying data packets to a subscriber station (SS) by taking a relay station (RS) into consideration when a base station (BS) establishes a data packet scheduling is disclosed. According to the method, a data packet is relayed by RSs, which have a signal intensity greater than a threshold value for all RSs appointed by the BS. Each SS determines whether the SS receives the data packet directly from the BS or via an RS, based on signal intensities between the SS and the BS and between the SS and RSs, and feeds channel information corresponding to the determination back to the BS, thereby allowing the data packet to be transmitted.Type: GrantFiled: July 14, 2006Date of Patent: January 5, 2010Assignee: Samsung Electronics Co., LtdInventors: Dae-Young Park, Seung-Young Park, Sang-Boh Yun
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Patent number: 7620394Abstract: A communications system includes a first wireless communications system configured to provide wireless communications over a first frequency band, and a second wireless communications system configured to provide wireless communications using at least a portion of the first frequency band. The system includes an inter-system communications link between the first wireless communications system and the second wireless communications system. The inters-system communications link is used to coordinate the use of the first frequency band. The system further includes an interference reducer configured to reduce interference between the first wireless communications system and the second wireless communications system. Related methods are also disclosed.Type: GrantFiled: February 21, 2006Date of Patent: November 17, 2009Assignee: ATC Technologies, LLCInventors: Alexander H. Good, Charlene J. King, Eric A. Swank, Monish Kundra, Peter D. Karabinis
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Patent number: 7620004Abstract: Methods of providing power overload control in a communication system having a least one base station serving one or more users of at least one cell are described which may avoid an overload condition in the system. In one aspect, a target signal-to-interference ratio (SIRtarget) may be controlled for inner loop power control implemented by the base station, so as to maintain the loading of the communication system below an overload condition. In another aspect, a target block error rate (BLERtarget) may be controlled for outer loop power control implemented by the base station, so as to maintain the loading of communication system below an overload condition.Type: GrantFiled: April 30, 2004Date of Patent: November 17, 2009Assignee: Alcatel-Lucent USA Inc.Inventors: Stefan Brueck, Jens Mueckenheim, Patrick Charriere
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Publication number: 20090201847Abstract: A collection of methods, which when combined together provide suitable bandwidth resources for real-time content exchange over a satellite-based network, wherein the network employs a reservation-based access scheme, such as but not limited to DVB-RCS. Furthermore, the methods provide suitable bandwidth wherein transmission conditions deteriorate while real-time content is being exchanged and the already allocated resources can no longer be used.Type: ApplicationFiled: February 9, 2009Publication date: August 13, 2009Applicant: GILAT SATELLITE NETWORKS, LTD.Inventors: Amir Yabo, Yoseph Hecht, Magal Pinchas
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Patent number: 7554960Abstract: Methods and systems for reducing the cost of cellular backhaul are disclosed.Type: GrantFiled: June 9, 2005Date of Patent: June 30, 2009Assignee: Vanu, Inc.Inventors: Jeffrey Steinheider, Vanu Bose
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Patent number: 7539475Abstract: Special DC tone treatment in a wireless communications system, e.g., an OFDM system, is discussed. In the downlink, a wireless terminal receiver introduces self-interference at the DC tone from the RF/baseband conversion. A base station every so often does not transmit on the downlink DC tone while continuing to transmit on other downlink tones. Wireless terminals measure received signal on the downlink DC tone during the time of suspended DC tone transmission, estimate self-interference and apply a correction to other received downlink DC tones. In the uplink DC tone interference is a composite of the assigned wireless terminal transmitter's baseband/RF conversion self-interference and air link noise. During one symbol interval of an N symbol interval dwell, the uplink DC tone is reserved for a special modulation symbol, which is a predetermined function of the other N?1 modulation symbols.Type: GrantFiled: September 16, 2005Date of Patent: May 26, 2009Assignee: QUALCOMM IncorporatedInventors: Rajiv Laroia, Junyi Li, Hui Jin
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Patent number: 7539163Abstract: A method for handing off a connection of a mobile device from a first access point to a second access point in an Internet Protocol-based multimedia mobile network includes the steps of scanning the network for available access points, comparing a connection strength of each available access point to a pre-determined margin, authenticating access points determined to be above the pre-determined margin, adding the authenticated access points to an association table; checking a connection strength to the first access point to the pre-determined margin, selecting an authenticated access point as the second access point if the connection strength to the first access point is below the pre-determined margin, and removing the first access point from the association table.Type: GrantFiled: June 7, 2004Date of Patent: May 26, 2009Inventor: Jeou-Kai Lin
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Patent number: 7483404Abstract: A mobile terminal in CDMA-TDD system and a method thereof, wherein the terminal comprises a receiving means, receiving and processing wireless signals from a downlink; a transmitting means, transmitting wireless signals via a uplink; and a transmit power control means, receiving a power control message transmitted via the downlink, after acquiring a channel gain value between said mobile terminal and a base-station, calculating a value of the transmit power of said mobile terminal according to said power control message, said channel gain value and a set processing gain value, and adjusting the transmit power of said mobile terminal according to said value of the transmit power, wherein said adjusting the transmit power of said mobile terminal is synchronized with those of other terminals assigned within a same time slot.Type: GrantFiled: December 23, 2003Date of Patent: January 27, 2009Assignee: ST Wireless SAInventor: Shu Zhang
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Patent number: 7474884Abstract: The present invention relates to a method for a digital receiver and a receiver exploiting second order statistics for adaptive co-channel interference rejection in wireless communication. It uses digitally I, in phase, and Q, quadrature, branches of a received transmitted signal as input to the receiver, a coarse synchronization and a coarse frequency offset compensation have being performed on the signal. It comprises a means for derotation, means for separation, means for filtering, means for estimating and means for detecting transmitted symbols in the received signal. The invention thereby improving co-channel rejection in wireless communication, thus making it possible to increase the number of communication channels for frequencies used.Type: GrantFiled: September 11, 2006Date of Patent: January 6, 2009Assignee: Nokia CorporationInventors: Martin Kristensson, Bjorn Ottersten, David Astély
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Patent number: 7466682Abstract: Determining RF capacity of a wireless network and measuring BTS performance. Preferred methods include collecting forward link data at a BTS transmit port, where the data includes the power level associated with each Walsh code of each sector for each carrier over a predetermined time interval, and then processing the data by identifying each channel as using either second generation CDMA technology (a “2G” call) or third-generation technology (a “3G” call). Voice and data may also be identified. The power level may be determined by measuring a signal level (e.g., dB), and subsequently accounting for any RF losses through a calibration step, and finally converting the power-per-Walsh code to an absolute power level (e.g., dBm, or watts). The average user power per link (ppl) is then determined and the number of users per technology (2G versus 3G) is also determined.Type: GrantFiled: February 27, 2004Date of Patent: December 16, 2008Assignee: Sprint Spectrum L.P.Inventors: Hector Ribas, John Humbert, Abhijit Apte, Ryan Talley, Meng Yew, Michael Shafer
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Patent number: 7460500Abstract: A multicarrier transmission apparatus that achieves both power efficiency in a high-frequency amplifier and quality of transmission signal in a radio transmission system in next-generation mobile communications that supports high speed data packet transmission. In the apparatus, adaptive peak limiter 400 performs adaptive hard limit processing on baseband signals of frequency channels passed through multiplexing sections 200a to 200d for users, multicarrier signal generating circuit 500 with peak suppressing function performs peak limit processing on a synthesized multicarrier signal, hybrid distortion compensating circuit 700 corrects non-linear distortion due to high-frequency amplifier 32, and the multicarrier signal is transmitted from an antenna (ANT).Type: GrantFiled: June 30, 2005Date of Patent: December 2, 2008Assignee: Panasonic CorporationInventors: Hiroshi Itahara, Yuichi Hagiwara
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Patent number: 7457259Abstract: This invention provides interference predictions, suitable for least interference dynamic channel assignment use or other frequency hopping uses by de-coupling the time slot assignment and the frequency hopping pattern assignment. In particular, a least interfered time slot is selected based on an aggregate interference measurement performed across an entire transmission band or a pre-specified range of frequencies in the transmission band. A user is assigned a least interfered time slot and provided an appropriate frequency hopping pattern.Type: GrantFiled: September 1, 2005Date of Patent: November 25, 2008Assignee: AT&T CorpInventors: Li Fung Chang, Kapil K. Chawla, Justin Che-I Chuang, Bruce Edwin McNair, Xiaoxin Qiu
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Patent number: 7454167Abstract: A repeater for re-transmitting uplink and downlink signals in a wireless network. The repeater uses antenna cross-polarization, signal cancellation and digital processing techniques to reduce or eliminate coupling of echo signals between the receive and transmit antennas of the downlink and uplink signal paths in the repeater.Type: GrantFiled: June 6, 2005Date of Patent: November 18, 2008Assignee: Samsung Electronics Co., Ltd.Inventor: Joseph R. Cleveland
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Patent number: 7444169Abstract: A wireless base station apparatus (100) used in a wireless communications system includes a statistical processing unit (140) that performs statistical processing on downlink radio quality information reported from a wireless communications terminal device; a radio quality information offsetting unit (160) that adjusts the statistically processed downlink radio quality information based on a downlink transmission confirmation (ACK/NACK/DTX) message transmitted from the wireless communications terminal device and a required downlink quality; a transport format determination unit (170) that determines a downlink transport format based on the statistically processed radio quality information or the offset-adjusted radio quality information; and a transmitting unit (111) that transmits a downlink channel with the determined downlink transport format.Type: GrantFiled: April 27, 2005Date of Patent: October 28, 2008Assignee: NTT DoCoMo, Inc.Inventors: Hiroyuki Ishii, Masafumi Usuda, Yoshimasa Imamura, Akihito Hanaki
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Patent number: 7394780Abstract: A communication network control method for a communication network including a hub and a plurality of user nodes includes adjusting system parameters to maximize communication data rate and minimize bit error rate given current conditions of the wireless channel, current loading of the network, and user constraints. In particular, the method includes transmitting a first plurality of symbols with a first modulation and first forward error correction in a frame from the hub to a first user node, and transmitting a second plurality of symbols with a second modulation and second forward error correction in the frame from the hub to the second user node.Type: GrantFiled: November 26, 2003Date of Patent: July 1, 2008Assignee: Idirect IncorporatedInventors: Christopher D. Gregory, David D. Bettinger
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Patent number: 7376095Abstract: An apparatus and method for measuring an SIR in a CDMA mobile communication system. The SIRs and power of PICHs and the power of PDCHs are measured sequentially for a plurality of active set base stations. An active set base station having the highest signal strength is selected according to the measurements. Thus a data rate is determined adaptively to the SIR for efficient high rate packet data transmission.Type: GrantFiled: August 21, 2002Date of Patent: May 20, 2008Assignee: Samsung Electronics Co., LtdInventors: Sang-Min Bae, Ji-Won Ha, Jin-Woo Heo, Jong-Han Kim
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Publication number: 20080075032Abstract: The present invention provides a method for allocating portions of a frame to a plurality of mobile units including a plurality of frequency subcarrier sets and a plurality of symbols. The method includes determining at least one zone comprising at least one of the plurality of subcarrier sets and at least one of the plurality of symbols and determining a plurality of subzones. Each subzone includes at least one of the plurality of subcarrier sets and at least one of the plurality of symbols in the at least one zone. The method also includes associating each of the plurality of mobile units with at least one of the subzones and allocating a portion of the subcarrier sets and symbols in each subzone to the mobile units associated with each subzone.Type: ApplicationFiled: September 22, 2006Publication date: March 27, 2008Inventors: Krishna Balachandran, Doru Calin, Niranjan Sudhir Joshi, Joseph H. Kang, Achilles Kogiantis
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Publication number: 20080025245Abstract: An apparatus for providing wireless telephone, television and positioning services to an allocated space at a venue having alterable space allocations is provided. The apparatus includes a wireless communication sub-system configured to couple the apparatus to a wireless network to receive the services via respective sub-systems. A telephone connection sub-system is configured to wirelessly couple a telephone communication device such as a POTS telephone or point of sale (POS) device to receive the telephone services. A television connection sub-system is configured to wirelessly couple a television to receive the television services. A positioning sub-system is configured to wirelessly couple the apparatus to receive the positioning services. The positioning sub-system comprises a positioning device (e.g. GPS chipset/radio) to obtain positioning data for the apparatus to provide to the positioning services.Type: ApplicationFiled: July 27, 2006Publication date: January 31, 2008Inventors: Justin P. Sweeney, John S. Koperwas
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Patent number: 7302232Abstract: An adaptive antenna control method is used for a radio communication system built by a plurality of radio base stations and a plurality of terminal stations capable of communicating with the radio base stations. Each radio base station includes an adaptive antenna having a plurality of antenna elements, a distributor for generating signals to be input to the plurality of antenna elements by branching a signal of one system to be transmitted, and weighting circuits for respectively weighting transmission signals to the plurality of antenna elements. For reception by each terminal station, an interference wave power given by the transmission signal from each of the plurality of radio base stations is estimated. A weight in the adaptive antenna of each radio base station is determined to minimize a sum of square errors between reception signals and desired signals for all the radio base stations which simultaneously use the same communication channel.Type: GrantFiled: August 28, 2001Date of Patent: November 27, 2007Assignee: Nippon Telegraph and Telephone CorporationInventors: Yasushi Takatori, Keizo Cho, Toshikazu Hori, Kentaro Nishimori
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Patent number: 7298715Abstract: The present invention provides a technique to reduce the number of RF components by using digital signal processing functions in wireless receivers having two or more antennas, which results in the reduction of system cost. The reduction occurs by using a multiplexer or switch to sample the signal received by each of the antennas. The sampling rate of the multiplexer or switch is greater than the Nyquist required sampling rate (Fs) of the received signal bandwidth. The sampled signal is a multiplexed single analog (RF) signal, which only requires one chain of receiver components. A signal processor then is able to demultiplex the received signal at a lower frequency and can perform several functions including antenna diversity and beam forming utilizing digital signals at IF or baseband frequencies.Type: GrantFiled: March 14, 2001Date of Patent: November 20, 2007Assignee: Vyyo LtdInventor: Hillel Hendler
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Patent number: 7283836Abstract: An apparatus and method of detecting whether data exists in a received signal while a mobile communication terminal is in discontinuous transmission mode. The apparatus and method comprises generating and transmitting a forward power control command for providing the forward power control, and performing forward power control in a mobile communication system. According to the forward power control method, a power control command is generated based on a received frame including a plurality of slots each of which includes power control bits.Type: GrantFiled: September 29, 2003Date of Patent: October 16, 2007Assignee: Samsung Electronics Co., Ltd.Inventors: Jong-Yoon Hwang, Hi-Chan Moon, Jong-Han Kim, Jin-Soo Park
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Patent number: 7277405Abstract: A system for reducing or eliminating cross talk resulting from co-channel interference in TDMA communication systems is disclosed. In general, the system may include one or more enhanced mobile stations sending, to an enhanced base station, base station identifying information in a training period that was previously used by mobile units to send pseudotrainiug information. The base station identifying information may include, but is not limited to, global cell site identification or any portion thereof or local cell site identification or any portion thereof. Upon receipt of information including the appropriate base station identifying information, die enhanced base station may perform enhanced synchronization and reception and correction functions.Type: GrantFiled: December 27, 2001Date of Patent: October 2, 2007Assignee: Motorola, Inc.Inventors: Michael N. Kloos, David A. Hensley, Christopher L. Johnson
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Patent number: 7250541Abstract: This invention is used in communications, for example, in expanded signal spectrum broadband communication systems. The technical effect of this invention consists in an enhanced narrow-band interference suppression factor and almost complete elimination of the effect displayed by a powerful narrow-band interference or a group of narrow-band interferences in a limited frequency band. A noise signal formed in the frequency band (F0, F1) in the transmission channel of a broadband communication system is power-modulated by a given modulation technique at a modulation frequency Fmod<<(F1?F0) and passed through a propagation medium, in which a narrow-band interference is superimposed thereon; received in the receiver; filtered in the frequency band (F0, F1); amplified, and divided into two signals. One of the signals is obtained by amplifying the filtered signal and limiting the amplitude thereof, and the other signal is the filtered signal or a signal linearly amplified without altering the shape thereof.Type: GrantFiled: August 19, 2003Date of Patent: July 31, 2007Inventors: Mihail Nikolaevich Bobkov, Aleksei Aleksandrovich Galitsin, Vasiliy Vasilievich Kalugin
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Patent number: 7242732Abstract: New version packet data devices support a backwards-compatible signal format. New version devices operate within a first frequency band while old version devices operate within a second frequency band. The first frequency band differs from but overlaps with the second frequency band. The new version devices may operate on a first carrier frequency (within the first frequency band) while old version devices may operate at a second carrier frequency (within the second frequency band). The new version devices and/or the old version devices may also support carrier-less modulations. Preamble, header, and trailer portions of a new version signal include a plurality of spectral copies of a baseband modulated signal. One or more of these spectral copies of the baseband modulated signal is/are indistinguishable from corresponding components of an old version signal. The payload of the new version signal may be formed in the same manner or may be formed in have a wider bandwidth, higher data rate format.Type: GrantFiled: February 15, 2002Date of Patent: July 10, 2007Assignee: Broadcom CorporationInventors: Eric Ojard, Jason Trachewsky
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Patent number: 7197276Abstract: A downstream adaptive modulation system and method. The downstream adaptive modulation system comprises a wireless access termination system and one or more wireless modems. The wireless access termination system includes a plurality of queues and a parser. The parser parses data traffic onto the plurality of queues. Each queue is associated with a different coding and modulation scheme. Each of the one or more wireless modems receives data traffic from the plurality of queues based on the wireless modem's ability to demodulate and decode the signal from each of the plurality of queues. When a wireless modem experiences a change in signal strength, the present invention enables the wireless modem to adapt to data from other queues to compensate for the change in signal strength. Thus, if the signal strength improves over a period of time, the wireless modem may receive data at a higher order modulation and FEC code rate.Type: GrantFiled: March 15, 2002Date of Patent: March 27, 2007Assignee: Broadcom CorporationInventors: Mark Dale, David Hartman, Anders Hebsgaard
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Patent number: 7180905Abstract: An access method for periodic contention-free sessions (PCFS) reduces interference between overlapping first and second wireless LAN cells contending for the same medium. Each cell includes a respective plurality of member stations and an access point (AP) station. The access method for periodic contention-free sessions (PCFS) includes a fixed cycle time that reduces conflicts with PCFS from other cells. The PCFS from several cells are repeated in cycles of cycle period (CP), which is the contention-free period (CFP) of an access point times a factor that is a function of the number of overlapping cells. Periodic contention-free sessions (PCFSs) are generated, one from each overlapping cell. PCFS transmission attempts occur at the fixed specified time spacing following the start of the previous cycle. Each active AP sets a timer at CP and a PCFS is initiated when the timer expires. The timer is then reset to CP and this starts a new cycle.Type: GrantFiled: September 27, 2002Date of Patent: February 20, 2007Assignee: AT & T Corp.Inventor: Mathilde Benveniste
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Patent number: 7151951Abstract: In controlling a multi-beam antenna system for downlink wireless communication, beamforming and closed loop transmit diversity signaling are combined. Each beam signal is adjusted at the transmitter based on feedback from a wireless mobile communication station such that the signals received at the wireless mobile communication station can be coherently combined.Type: GrantFiled: December 23, 2002Date of Patent: December 19, 2006Assignee: Telefonktiebolaget LM Ericsson (publ)Inventors: Bo Goransson, Andrew Logothetis, Bo Hagerman
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Patent number: 7107031Abstract: The present invention relates to a method for a digital receiver and a receiver exploiting second order statistics for adaptive co-channel interference rejection in wireless communication. It uses digitally I, in phase, and Q, quadrature, branches of a received transmitted signal as input to the receiver, a coarse synchronization and a coarse frequency offset compensation have being performed on the signal. It comprises a means for derotation, means for separation, means for filtering, means for estimating and means for detecting transmitted symbols in the received signal. The invention thereby improving co-channel rejection in wireless communication, thus making it possible to increase the number of communication channels for frequencies used.Type: GrantFiled: May 30, 2001Date of Patent: September 12, 2006Assignee: Nokia CorporationInventors: Martin Kristensson, Bjorn Ottersten, Astel David
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Patent number: 7103331Abstract: A power supply circuit of a low noise block converter (LNB) includes a plurality of output voltage regulators. A first output voltage regulator, a local oscillator circuit, a second output voltage regulator, and an LNA are connected in series in a direction in which a power supply current flows. Therefore, a voltage adjustment width of the output voltage regulator can be reduced and a power loss can be reduced. A value of current flowing in the power supply circuit can also be decreased. Accordingly, an LNB with a reduced power consumption can be realized.Type: GrantFiled: January 29, 2004Date of Patent: September 5, 2006Assignee: Sharp Kabushiki KaishaInventor: Koji Motoyama